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Ms Jones then sent the couple a shortlist of possible pooches, including the lucky terrier, before the final decision was made by the Tory leader and his partner.

Unlike 12-year-old tabby Larry, who belongs to No10 and has served under three Prime Ministers, the terrier will belong to Mr Johnson and his partner personally.

That means he will live in their flat above No11, which was remodelled during David Cameron's time in office, and will leave with them if he is booted out of power.

Mr Abraham told the Mirror the adoption would highlight small, volunteer-run shelters and Lucy's Law - which will make it illegal for anyone to sell puppies and kittens in England unless they are the breeder.

He had a pink rosette to promote Lucy's Law (Image: @carriesymonds/Twitter)